4 comments

mark says:

with the rechargeable system is it possible to use 2 batteries in line to get more leds and longer life out of the batteries. would the same charger be able to charge both batteries at the same time as long as there in line.

prodmod says:

The charger on this site can only charge one battery at a time. You would either need 2 jacks each leading to one battery, or one Jack with a switch used to select which battery you want to charge.

You can place the batteries in series to get 6v, you would then need to add a resistor to limit your current and prevent burning the LEDs. In general you do get more lit time with higher voltage, but as the battery dies out the lights just get dimmer and dimmer. This dimming of the lights is extended because you are starting up at 6v.

You will get better life if you use 6v and a 3v voltage regulator.

But if you are trying to add more than 21 LEDs just go ahead and use one 3v battery. I tested 42 LEDs and did not see a big change in current draw which means it should last about the same time